I agree people would be more receptive if he wasn't a egotistical jerk, but the ironic thing is people dismissing his work because he called them an IYI is just the other side of the fragile ego coin.
He's at his best with "black swan" and "skin in the game" type stuff - aphoristic, lyrical, qualitative philosophical musing that evokes the best of traditional schools of thought.
What's interesting about Taleb is that given his takes on GMOs and "naive interventionism" he seems to have been advocating quite strongly for COVID vaccination against people that have tried to use his ideas to argue against it.
It would have been so easy for him to use "antifragility" to follow so many other pubic intellectuals who saw an opportunity to promote their "heterodox" brand and gather followers advocating for natural immunity and other remedies.